Add sort lines option to the editor

[tzontron]

Extend CodeMirror to provide Sorting ascending/descending lines selection option

for eg.

2018-08-04 price VBMPX                              63.48 USD
2017-08-04 price RGAGX                              64.31 USD
2016-08-04 price ITOT                              184.36 USD
2014-08-04 price VEA                               228.73 USD
2017-08-04 price VHT                               117.19 USD
2017-05-04 price GLD                                73.91 USD

should become (ascending)

2014-08-04 price VEA                               228.73 USD
2016-08-04 price ITOT                              184.36 USD
2017-05-04 price GLD                                73.91 USD
2017-08-04 price RGAGX                              64.31 USD
2017-08-04 price VHT                               117.19 USD
2018-08-04 price VBMPX                              63.48 USD

Two options can be added under the edit menu:

• Sort (ascending) Ctrl+Alt+)
• Sort (descending) Ctrl+Alt+(

[yagebu]

A PR for this would be welcome :)